diff --git a/pkg/collectconfig/executor/consumer_log_sub_analysis.go b/pkg/collectconfig/executor/consumer_log_sub_analysis.go
index 50234df..b6bee04 100644
--- a/pkg/collectconfig/executor/consumer_log_sub_analysis.go
+++ b/pkg/collectconfig/executor/consumer_log_sub_analysis.go
@@ -140,11 +140,11 @@ func (c *logAnalysisSubConsumer) ProcessGroup(iw *inputWrapper, ctx *LogContext,
 func (c *logAnalysisSubConsumer) Emit(expectedTs int64) bool {
 	var state *logAnalysisSubConsumerState
 	c.parent.timeline.Update(func(timeline *storage.Timeline) {
-		shard := c.parent.timeline.GetShard(expectedTs, true)
+		shard := c.parent.timeline.GetShard(expectedTs)
 		if shard == nil {
 			return
 		}
-		shard.Frozen = true
+		defer shard.Freeze()
 		if shard.Data == nil {
 			return
 		}
diff --git a/pkg/collectconfig/executor/consumer_log_sub_stat.go b/pkg/collectconfig/executor/consumer_log_sub_stat.go
index dddbe2f..313bacb 100644
--- a/pkg/collectconfig/executor/consumer_log_sub_stat.go
+++ b/pkg/collectconfig/executor/consumer_log_sub_stat.go
@@ -151,14 +151,14 @@ func (c *logStatSubConsumer) Emit(expectedTs int64) bool {
 
 	var datum []*model.DetailData
 	c.parent.timeline.Update(func(timeline *storage.Timeline) {
-		shard := timeline.GetShard(expectedTs, true)
+		shard := timeline.GetShard(expectedTs)
 		if shard == nil {
 			logger.Infoz("[consumer] [log] emit nil", //
 				zap.String("key", c.parent.key),            //
 				zap.Time("ts", time.UnixMilli(expectedTs))) //
 			return
 		}
-		shard.Frozen = true
+		defer shard.Freeze()
 		points := shard.InternalGetAllPoints()
 		for _, v := range points {
 			tags := make(map[string]string, len(v.Keys))
diff --git a/pkg/collectconfig/executor/storage/storage.go b/pkg/collectconfig/executor/storage/storage.go
index 04c3940..e2c110c 100644
--- a/pkg/collectconfig/executor/storage/storage.go
+++ b/pkg/collectconfig/executor/storage/storage.go
@@ -158,7 +158,7 @@ func (t *Timeline) Unlock() {
 }
 
 func (t *Timeline) GetOrCreateShard(ts int64) *Shard {
-	shard := t.GetShard(ts, false)
+	shard := t.GetShard(ts)
 	if shard == nil {
 		shard = t.CreateShard(ts)
 	}
@@ -169,7 +169,7 @@ func (t *Timeline) InternalGetShard() []*Shard {
 	return t.shards
 }
 
-func (t *Timeline) GetShard(ts int64, clear bool) *Shard {
+func (t *Timeline) GetShard(ts int64) *Shard {
 	if t.shards == nil {
 		return nil
 	}
@@ -182,12 +182,6 @@ func (t *Timeline) GetShard(ts int64, clear bool) *Shard {
 	if s.no != no {
 		return nil
 	}
-	// release memory quickly
-	if clear {
-		s.points = nil
-		s.Data = nil
-		s.Data2 = nil
-	}
 	return s
 }
 
@@ -235,3 +229,10 @@ func (s *Shard) InternalGetAllPoints() map[string]*Point {
 func (s *Shard) PointCount() int {
 	return len(s.points)
 }
+
+func (s *Shard) Freeze() {
+	s.Frozen = true
+	s.points = nil
+	s.Data = nil
+	s.Data2 = nil
+}